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FLAC3D Command: Model

MODEL   keyword <overlay n> <range . . .>
               or
               load filename

This command associates a constitutive model with specified zones in the grid. If a range is given, then the model is associated with only those zones within the range. If no range is specified, then the model is associated with the entire grid.

During the calculation, zones will behave according to a constitutive model corresponding to one of the keywords given below. (The mechanical constitutive models are described in Section 2 in Theory and Background, the creep models in Section 2 in Optional Features, the thermal models in Section 1 in Optional Features and the fluid flow models in Section 1 in Fluid-Mechanical Interaction. All are to be found in the FLAC3D Manual).

The optional keyword overlay assigns either two overlaid sets of five constant-strain tetrahedral elements to each zone (n = 2), or one set of five tetrahedral elements to each zone (n = 1). The default is set to double-overlaid elements (n = 2).

The keyword load loads a DLL version of a constitutive model, identified by filename. Once loaded, the DLL model can be assigned to zones in the grid using the MODEL command and range keywords. See Section 4 in Optional Features (FLAC3D Manual) for a guide to creating user-defined models as DLLs. MODEL load can only be applied if CONFIG cppudm is invoked.

Mechanical Models

anisotropic    transversely isotropic elastic model

cam-clay    modified Cam-clay plasticity model

doubleyield    double-yield (cap) plasticity model

drucker    Drucker-Prager plasticity model

elastic    isotropic elastic model

finn    dynamic pore-pressure generation model (available only for the dynamic option)hoekbrown    generalized Hoek-Brown model

mohr    Mohr-Coulomb plasticity model

null    null model

orthotropic    orthotropic elastic model

ssoftening    strain-hardening/softening plasticity model

subiquitous    bilinear strain-hardening/softening ubiquitous-joint plasticity model

ubiquitous    ubiquitous-joint model

 Creep Models (available only for creep model option)

burger    Burger's substance viscoelastic model

cpower    power-law viscoplastic model

cvisc     Burger-creep viscoplastic model

cwipp    crushed-salt constitutive model

power    two-component power law

pwipp    WIPP-creep viscoplastic model

viscous    classical viscoelastic model

wipp    WIPP reference creep formulation

Fluid-Flow Models

fl_anisotropic    anisotropic fluid flow

fl_isotropic    isotropic fluid flow

fl_null    null flow model. Null zones model impermeable material. Note that, for the coupled fluid-flow mechanical process, if zones are nulled mechanically, they must also be nulled for fluid flow (default).

 Thermal Models (available only for thermal model option)

th_ac    isotropic advection-conduction

th_anisotropic    anisotropic thermal conductivity

th_isotropic    isotropic heat conduction

th_null    null thermal model. Null zones model excavated material and insulators. Note that zones made null mechanically are not automatically made null thermally.

  • 1
  • quote PedroNunes reply
  • 2013-9-25 23:04:17
  • Greetins, i need a little help.
    My question is...there´s any command to excavate the block using the p0,p1,p2 and p3 points to define the volume to excavate? My drifts are rectangular with dimensions 3x4. I have the coordinates of the center of the drifts. There´s another way to excavate without the "model null" command? or a way to use "model null" with the p0,p1,p2,p3.

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